WO2022236871A1

WO2022236871A1 - Ultra-large core-count optical cable for 5g

Info

Publication number: WO2022236871A1
Application number: PCT/CN2021/095781
Authority: WO
Inventors: 陈龙; 胡乐; 万文波; 吴金华; 沈聪; 孙文涛; 沈新华; 盛春敏; 严惠良; 马建林; 韦冬; 杨艳杰; 蒋莹; 王梦伟; 梁程诚; 许惠芳
Original assignee: 浙江东通光网物联科技有限公司
Priority date: 2021-05-11
Filing date: 2021-05-25
Publication date: 2022-11-17
Also published as: CN113376776A; ZA202104778B

Abstract

The present invention relates to an ultra-large core-count optical cable for 5G, which comprises a central reinforcement, a signal transmission body and a first sheath layer which are concentrically nested in sequence along a radial direction thereof. The signal transmission body comprises an inner layer signal transmission unit and an outer layer signal transmission unit which are concentrically nested. The inner layer signal transmission unit and the outer layer signal transmission unit are both composed of a plurality of core wires twisted circumferentially around the central axis of the central reinforcement. The core wires are composed by concentrically nesting a fiber bundle, a fiber paste filler and a loose tube. The fiber bundle is formed by assembling a plurality of optical fibers. In the actual forming and fabrication of the optical cable, the total number of optical fibers used to form the fiber bundle, the outer diameter of the optical fibers, the outer diameter of the loose tube, the total number of signal transmission units and the outer diameter of the first sheath layer are controlled. In the foregoing manner, on the premise of ensuring that the optical cable has the data transmission capabilities of a large number of cores, the cross-sectional size of the formed optical cable may be effectively reduced, and the weight per unit length may be reduced.

Description

A kind of ultra-large core count optical cable for 5G

technical field

The invention relates to the technical field of communication optical cable manufacturing, in particular to an optical cable with a super large number of cores for 5G.

Background technique

As the demand for information continues to grow, optical fiber communication is widely used as the communication method with the fastest signal transmission speed and the best transmission quality. Today, with the rapid development of network construction, the application of optical cables is becoming more and more extensive.

According to the different laying environment of the optical cable, it is divided into indoor optical cable and outdoor optical cable. Low, even breaks during operation, causing great hidden dangers to economy and safety. At present, all optical cables in the industry use Kevlar (aramid) or glass fiber yarn as reinforcement elements, which can improve the tensile performance of optical cables and avoid cable breakage in extreme environments. In addition, under the background of the development of 5G big data transmission, it is required that the optical cable contains enough optical fibers to improve its transmission capacity. It is known that with the increase of the number of optical fibers (that is, the number of cores) in the optical cable, the more materials used in the optical cable, the greater its own weight, the more Kevlar (aramid fiber) used, and the cost increases geometrically. Furthermore, the current conventional non-ribbon optical cable has a maximum number of cores of 288 cores (including 288 optical cables). Using a ribbon optical cable will lead to an excessively large overall size of the optical cable, which requires extremely high application space, which is not conducive to the implementation of subsequent laying operate. Therefore, it is urgent for technicians to solve the above problems.

Contents of the invention

Therefore, in view of the above-mentioned existing problems and defects, the designers of the present invention collected relevant information, after evaluation and consideration by many parties, and through continuous experiments and modifications by technicians with many years of research and development experience in this industry, they finally led to the 5G application. The emergence of ultra-large core-count optical cables.

In order to solve the above technical problems, the present invention relates to a 5G ultra-large-core optical cable, which includes a central strength member, a signal transmission body and a first sheath layer that are concentrically fitted in sequence along its radial direction. The signal transmission body includes an inner layer signal transmission unit and an outer layer signal transmission unit. The inner layer signal transmission unit is composed of M inner layer core wires twisted circumferentially around the central axis of the central reinforcement. The outer layer signal transmission unit is sheathed on the outer periphery of the inner layer signal transmission unit, and it is composed of N outer layer core wires that are also twisted around the central axis of the central reinforcement member in a circumferential direction. The design structure of the inner layer core wire and the outer layer core wire is exactly the same. Only for the inner core wire, it is composed of an optical fiber bundle, a fiber paste filling body and a loose tube that are concentrically sleeved from the inside to the outside. The optical fiber bundle is composed of Q optical fibers. (M+N)*Q>288. Assuming that the outer diameter of the optical fiber is D1, then D1≤0.25mm. Assuming that the outer diameter of the loose tube is D2, then D2≤1.8mm. Assuming that the outer diameter of the first sheath layer is D3, then D3≤10mm.

As a further improvement of the technical solution of the present invention, M=12; N=16; Q=36.

As a further improvement of the technical solution of the present invention, the optical fiber is preferably a G.654.E optical fiber.

As a further improvement of the technical solution of the present invention, the central reinforcement is subjected to overmolding treatment to form a PE plastic layer on its periphery.

As a further improvement of the technical solution of the present invention, the signal transmission body further includes a water-blocking yarn layer, an inner water-blocking belt layer and an outer water-blocking belt layer. The water-blocking yarn layer is interposed between the central reinforcement and the inner layer signal transmission unit, and is composed of a plurality of water-blocking yarns twisted circumferentially around the outer wall of the central reinforcement. The inner water resistance belt layer is sandwiched between the inner layer signal transmission unit and the outer layer signal transmission unit, and it is composed of a plurality of inner layer water resistance belts that are twisted circumferentially around the outer wall of the inner layer signal transmission unit. The outer water-blocking belt layer is composed of a plurality of outer-layer water-blocking belts that are twisted circumferentially around the outer wall of the outer-layer signal transmission unit.

As a further improvement of the technical solution of the present invention, the 5G ultra-large core-count optical cable also includes an airgel layer. The airgel layer is sandwiched between the outer water-blocking belt layer and the first sheath layer, and is directly formed on the outer water-blocking belt layer.

As a further improvement of the technical solution of the present invention, the 5G ultra-large-core optical cable also includes a second sheath layer. The second sheath layer is sheathed on the periphery of the first sheath layer.

As a further improvement of the technical solution of the present invention, the first sheath layer is preferably extruded from polyethylene plastic; the second sheath layer is preferably extruded from transparent nylon plastic.

As a further improvement of the technical solution of the present invention, the 5G ultra-large-core optical cable also includes a graphene thermal film layer. The graphene thermal film layer is sandwiched between the first sheath layer and the second sheath layer.

Compared with the ribbon optical cable with the traditional design structure, in the technical solution disclosed in the present invention, the signal transmission body is cylindrical as a whole, and is layered and sequentially twisted by multiple layers of signal transmission units surrounding the periphery of the central strength member. It is composed of the above-mentioned inner layer signal transmission unit and outer layer signal transmission unit. As for the core wires constituting the signal transmission unit, they are all composed of optical fiber bundles, fiber paste fillers and loose tubes that are concentrically sleeved. In the molding and manufacturing of the optical cable, the total number of optical fibers used to form the optical fiber bundle, the outer diameter of the optical fiber, the outer diameter of the loose tube, the total number of signal transmission units, and the outer diameter of the first sheath layer are controlled. By adopting the above-mentioned technical scheme to set up, under the premise of ensuring that it has a large number of core data transmission capabilities, the cross-sectional size of the formed optical cable can be effectively reduced, and the weight per unit length can be reduced, thereby greatly reducing the subsequent impact of the optical cable due to overheating. Limit the probability of accidental fracture due to tensile force.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of the first embodiment of an ultra-large core-count optical cable for 5G in the present invention.

Fig. 2 is a schematic structural diagram of the signal transmission body in the first embodiment of the 5G ultra-large-core optical cable of the present invention.

Fig. 3 is a schematic structural view of the inner layer core wire in the first embodiment of the ultra-large core count optical cable for 5G of the present invention.

Fig. 4 is a schematic structural diagram of a second embodiment of an ultra-large core-count optical cable for 5G in the present invention.

Fig. 5 is a schematic structural diagram of a third embodiment of an ultra-large core-count optical cable for 5G in the present invention.

Fig. 6 is a schematic structural diagram of a fourth embodiment of an ultra-large core-count optical cable for 5G in the present invention.

Fig. 7 is a schematic structural diagram of a fifth embodiment of an ultra-large core-count optical cable for 5G in the present invention.

1-central reinforcement; 11-PE plastic layer; 2-signal transmission body; 21-inner layer signal transmission unit; 211-inner core wire; 2111-fiber bundle; 21111-G.654.E optical fiber; Paste filling body; 2113-loose tube; 22-outer signal transmission unit; 221-outer core wire; 23-water-blocking yarn layer; 24-inner water-blocking layer; 25-outer water-blocking layer; 3- 1st sheath layer; 4-airgel layer; 5-second sheath layer; 6-graphene thermal film layer.

Detailed ways

The content of the present invention will be further described in detail below in conjunction with specific embodiments. Figure 1 shows a schematic structural view of the first implementation of the 5G ultra-large-core optical cable in the present invention. The transmission body 2 and the first sheath layer 3 are composed of several parts, wherein the central reinforcement 1 , the signal transmission body 2 , and the first sheath layer 3 are sequentially and concentrically fitted together along the direction from inside to outside. As shown in FIG. 2 , the signal transmission body 2 is at least divided into functional layers placed at a certain distance for signal transmission, which are respectively an inner layer signal transmission unit 21 and an outer layer signal transmission unit 22 . The inner layer signal transmission unit 21 is composed of 12 inner layer core wires 211 that are twisted circumferentially around the central axis of the central reinforcement 1 . The outer layer signal transmission unit 22 is sheathed on the periphery of the inner layer signal transmission unit 21 , and it is composed of 16 outer layer core wires 221 that are also twisted around the central axis of the central reinforcement 1 in a circumferential direction. The design structures of the inner core wire 211 and the outer core wire 221 are exactly the same. Only for the inner layer core wire 211 , it is composed of an optical fiber bundle 2111 , a fiber paste filling body 2112 and a loose tube 2113 which are concentrically fitted in sequence from the inside to the outside. The optical fiber bundle 2111 is composed of 36 G.654.E optical fibers 21111 (as shown in FIG. 3 ), so that the total number of cores of the super-large-core optical cable for 5G is controlled at 1080. Assuming that the outer diameter of the optical fiber 21111 is D1, then D1≤0.25mm. Assuming that the outer diameter of the loose tube 2113 is D2, then D2≤1.8mm. The outer diameter value of the first sheath layer 3 (that is, the size of the optical cable) varies with the number of optical fibers added. Generally speaking, for the convenience of laying construction and the consideration of reducing its own weight, it is assumed that the first sheath layer The outer diameter of 3 is D3, and D3 is unlikely to be larger than 10mm. In this way, on the one hand, a single optical cable contains 1008 optical fibers at the same time. Compared with the 288 cables on the market, the number of cores has been geometrically increased, which is enough to meet all current 5G application scenarios; on the other hand, the inner layer signal transmission The unit 21 and the outer signal transmission unit 22 are stranded in layers around the central strength member, and the formed optical cable is cylindrical in shape, which is more favorable than the traditional ribbon optical cable with the same transmission capacity. Realize compact and miniaturized design; on the other hand, in the molding and manufacturing of optical cables, the total number of optical fibers used to form signal transmission units, the outer diameter of G.654.E optical fibers, the outer diameter of loose tubes, and signal The total number of transmission units and the outer diameter of the first sheath layer 3 are controlled to ensure the miniaturization design of the optical cable, effectively reducing the cross-sectional size of the formed optical cable, reducing its own weight per unit length, and greatly reducing the follow-up factors of the optical cable. The probability of accidental fracture due to over-limit tension.

It is known that G.654.E optical fiber is mainly suitable for terrestrial transmission systems. It can increase the effective area of optical fiber and reduce the attenuation coefficient of optical fiber while maintaining the same basic performance as the existing single-mode optical fiber for terrestrial applications, thereby improving 400G transmission. performance.

However, the following points need to be explained here: 1) In addition to the above-mentioned G.654.E optical fiber 21111 to realize the transmission of signals, other small-diameter optical fibers can also be selected according to the production cost budget and the actual process capability of the workshop; 2) The number of inner layer core wires 211 used to form the inner layer signal transmission unit 21, the number of outer layer core wires 221 used to form the outer layer signal transmission unit 22, and the number of G.654.E optical fibers 21111 wrapped in the loose tube 2113 It can be set according to actual application scenarios and different customer needs; 3) The above-mentioned embodiment discloses the forming structure of the 1080-core optical cable, that is, the number of inner core wires 211 is set to 12, and the number of outer core wires 221 The number is 16, and the number of optical fibers contained in the inner core wire 211 or the outer core wire 221 is 36. In actual production and manufacturing, the above-mentioned quantity can be selected according to the actual application scenario and customer needs; 4) In actual application, if the interior of the optical cable is immersed in water, it will damage the optical fiber when it expands in a cold water freezing environment, and it will also damage the optical fiber. It will lead to an increase in the attenuation of the optical cable, which will affect the signal transmission. In view of this, in the above embodiment, the outer periphery of the G.654.E optical fiber 21111 is wrapped with a fiber paste filling body 2112 to protect it from moisture.

Fig. 4 shows a schematic structural view of the second embodiment of the 5G ultra-large-core optical cable in the present invention. The water yarn layer 23 , the inner water resistance belt layer 24 and the outer water resistance belt layer 25 . It can be clearly seen from FIG. 4 that the water-blocking yarn layer 23 is sandwiched between the central reinforcement 1 and the inner layer signal transmission unit 21, and it is twisted circumferentially by a plurality of outer walls surrounding the central reinforcement 1. Composed of suitable water-blocking yarns. The inner resistance hose layer 24 is sandwiched between the inner layer signal transmission unit 21 and the outer layer signal transmission unit 22, and it consists of a plurality of inner layers twisted circumferentially around the outer wall of the inner layer signal transmission unit 21 Water blocking tape composition. The outer water-blocking belt layer 25 is composed of a plurality of outer-layer water-blocking belts that are twisted circumferentially around the outer wall of the outer signal transmission unit 22 . In this way, when the optical cable is invaded by water, the internal resistance water belt layer 24 and the external water resistance belt layer 25 arranged on the outside can form two mutually independent water-proof layers, even if a small amount of water invades successfully, it will be blocked. The high water-absorbent water-blocking yarn is absorbed to avoid subsequent invasion of the inner core wire 211 and the outer core wire 221; 2) Plastic-wrapping the central reinforcement 1 to form a PE plastic layer 11 around it. After the optical cable is formed, the existence of the PE plastic layer 11 can effectively prevent the water-blocking yarn layer 23 and the inner core wire 211 from slipping in the axial direction, which is beneficial to ensure the regularity of the inner signal transmission unit 21 .

What needs to be explained here is that in the molding and manufacturing process of the optical cable, in order to control the overall outer diameter of the optical cable, it is necessary to limit the molding thickness of the inner water-blocking layer 24 and the outer water-blocking layer 25, which generally should not exceed 0.5mm .

Fig. 5 shows a schematic structural view of the third embodiment of the 5G ultra-large-core optical cable in the present invention. The airgel layer 4 is sandwiched between the 3. The airgel layer 4 is directly formed on the outer water-blocking belt layer 25 . In the actual application of optical cables, airgel exerts very good heat insulation performance, so that the inner layer signal transmission unit 21 and the outer layer signal transmission unit 22 are thermally isolated from the external environment, avoiding external high or low temperature environment Effect on signal transmission performance.

Figure 6 shows a schematic structural view of the fourth embodiment of the 5G ultra-large-core optical cable in the present invention. Second sheath layer 5. The existence of the second sheath layer 5 can effectively further improve the protection capability of the optical cable, and reduce the probability of damage due to external force.

In addition, as a further optimization of the structure of the above-mentioned ultra-large-core optical cable for 5G, the second sheath layer 5 is preferably extruded from transparent nylon plastic, so that it has the function of light transmission. After the fiber optic cable is laid, a series of light sources (such as lighting-grade lasers) are added along its length. In this way, on the one hand, the light transmission characteristics of the second sheath layer are used to transmit light, so that the optical cable emits weak light at night, which can allow some birds, beasts, squirrels, etc. to go around and prevent biological bites; on the other hand On the one hand, it is convenient for outdoor operators to identify optical cables at night, which is conducive to the execution of laying or post-maintenance work.

Fig. 7 shows a schematic structural view of the fifth embodiment of the 5G ultra-large-core optical cable in the present invention. A graphene thermal film layer 6 is added between the layers 5 . It is known that the graphene thermal film 6 has a good thermal conductivity effect, and at the same time, the cost is relatively low (10-20 yuan/㎡). In the actual application of the optical cable, by adding energy-level lasers at both ends, the heat is transferred to the surface of the optical cable by virtue of the high thermal conductivity of the graphene thermal film 6, so as to prevent the surface of the optical cable from being covered with ice, so as to achieve anti-coating Ice effect.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

A 5G optical cable with a super large number of cores, including a central strength member, a signal transmission body and a first sheath layer that are sequentially and concentrically fitted along its radial direction, characterized in that the signal transmission body includes an inner layer of signal transmission unit, an outer layer signal transmission unit; the inner layer signal transmission unit is composed of M inner layer core wires twisted circumferentially around the central axis of the central reinforcement; the outer layer signal transmission unit is sleeved on the The periphery of the inner layer signal transmission unit, and it is composed of N outer layer core wires that are also twisted circumferentially around the central axis of the central reinforcement; the inner layer core wire and the outer layer core wire The design structure is exactly the same; only for the inner core wire, it is composed of an optical fiber bundle, a fiber paste filling body and a loose tube that are concentrically fitted in sequence from the inside to the outside; the optical fiber bundle is composed of Q optical fibers It is assembled; (M+N)*Q>288; assuming that the outer diameter of the optical fiber is D1, then D1≤0.25mm; assuming that the outer diameter of the loose tube is D2, then D2≤1.8mm; assuming The outer diameter of the first sheath layer is D3, and D3≤10mm.
The 5G ultra-large-core optical cable according to claim 1, wherein M=12; N=16; Q=36.
The 5G ultra-large-core optical cable according to claim 1, wherein the optical fiber is a G.654.E optical fiber.
The 5G ultra-large core-count optical cable according to claim 1, wherein the central strengthening member is subjected to plastic wrapping treatment to form a PE plastic layer on its periphery.
According to any one of claims 1-4, the 5G ultra-large-core optical cable is characterized in that the signal transmission body also includes a water-blocking yarn layer, an internal water-blocking layer and an external water-blocking layer; The water-blocking yarn layer is sandwiched between the central reinforcement and the inner layer signal transmission unit, and is composed of a plurality of water-blocking yarns twisted circumferentially around the outer sidewall of the central reinforcement; The inner resistance hose layer is interposed between the inner signal transmission unit and the outer signal transmission unit, and it is circumferentially twisted by a plurality of outer walls surrounding the inner signal transmission unit The inner layer of water-blocking tape is composed of; the outer layer of water-blocking tape is composed of a plurality of outer layer of water-blocking tapes that are circumferentially twisted around the outer wall of the outer layer signal transmission unit.
The 5G ultra-large-core optical cable according to claim 5, further comprising an airgel layer; the airgel layer is sandwiched between the outer water resistance layer and the first sheath layer between, and directly molded on the outer water-blocking belt layer.
The 5G ultra-large core count optical cable according to claim 5, further comprising a second sheath layer; the second sheath layer is sheathed on the periphery of the first sheath layer.
According to claim 7, the optical cable with super large number of cores for 5G is characterized in that, the first sheath layer is extruded from polyethylene plastic; the second sheath layer is extruded from transparent nylon plastic .
According to claim 8, the optical cable with super large number of cores for 5G is characterized in that it also includes a graphene thermal film layer; the graphene thermal film layer is sandwiched between the first sheath layer and the second sheath layer between layers.